Infrared Human Motion Detection Using Intensity Variance Filtering
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Solution Overview
Problem
Distance sensors used in liquid crystal display apparatuses may inaccurately detect objects other than human bodies and cannot be applied in environments where infrared irradiation is prohibited, such as medical sites due to the intensity of the infrared rays they emit.
Innovation Solution
A control apparatus comprising a detector to emit and detect infrared rays, a state signal generator to differentiate between human approach and departure based on intensity variance, and a controller to start or stop controlling external devices accordingly, using a high-pass filter to filter out temperature fluctuations and reduce erroneous operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distance sensor emitting intense infrared rays is used to detect human bodies, then the detection capability is improved, but the risk of detecting objects other than human bodies increases and it cannot be applied in environments where infrared irradiation is prohibited
Solution Approach 1:
The patent changes the parameter of infrared ray intensity from high to low. The detector is configured to detect infrared rays emitted from human bodies with low intensity, eliminating the need for intense infrared irradiation while maintaining detection capability. This resolves the contradiction by adjusting the intensity parameter to a safe level that prevents harmful effects while still enabling human body detection.
Solution Approach 2:
The patent employs feedback mechanisms through the state signal generator that analyzes intensity variance patterns. The system continuously monitors infrared ray intensity variations and uses feedback control to distinguish human bodies from other objects based on characteristic motion patterns, maintaining accurate detection without requiring intense infrared rays.
2Measurement precision
If a distance sensor is used to detect human bodies, then the detection function is achieved, but erroneous operations occur due to detecting objects other than human bodies
Solution Approach 1:
The patent applies dynamics by detecting motion rather than static presence. The state signal generator identifies human bodies based on dynamic intensity variance patterns caused by movement. This dynamic approach distinguishes living human bodies from stationary objects, significantly reducing erroneous detections while maintaining detection accuracy.
Solution Approach 2:
The system uses feedback control where the state signal generator continuously analyzes infrared ray intensity variations and compares them against expected human motion patterns. This feedback mechanism enables the system to reliably distinguish human bodies from other objects by recognizing characteristic motion signatures, thereby reducing error rates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately detects human motions while minimizing erroneous operations and can be safely used in environments where intense infrared irradiation is not allowed by differentiating between human presence and absence without emitting intense infrared rays.
Implementation Method 1
a detector configured to detect an infrared ray emitted from a human body
Data Source
AI summary
A display apparatus includes a detector configured to detect an infrared ray emitted from a human body; a state signal generator configured to generate a state signal including at least one of a first state signal component indicating that the human body is approaching the detector and a second state signal component indicating that the human body is leaving from the detector in response to an intensity variance of the infrared ray detected with the detector; and a controller configured to start controlling an external device upon detecting the first state signal component from the state signal generated by the state signal generator but to stop controlling the external device upon detecting the second state signal component from the state signal.